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PHOENIX -- The Federal Bureau of Investigation says the man accused of murdering four people and then killing himself this week, was the subject of an ongoing domestic terrorism investigation.

Special Agent in Charge James L. Turgal said there is no connection between the domestic terrorism case and the domestic-related shooting that occurred Wednesday in Gilbert, but said J.T. Ready has long been on the F.B.I.'s radar.

"Facts and circumstances came to the FBI which indicated J.T. Ready was engaged in criminal activity in furtherance of his political or social ideology," Turgal said.

Ready was a known neo-Nazi and member of the National Socialist Movement. He was the leader of the U.S. Border Guards, a militia group which patrolled the desert near the U.S./Mexico border.

According to a probable cause statement compiled by the FBI, agents discovered a cache of weapons in the garage of the Gilbert home Ready shared with his girlfriend, where the mass shooting took place.

The special agent bomb technician who recovered the explosives noted that the grenades were "most likely stolen from the military as they are illegal to possess and not available to the civilian market. These grenades are not properly stored at this location."

"There's no legitimate sporting purpose for anyone to have two dozen 40 milimeter grenades in a non-law enforcement or military environment," said Joe Gordon, a retired ATF agent who is now a private investigator. "It's irresponsible and criminal to have them in a residential neighborhood."

According to the search warrant, officers removed computers, written notes, and DVDs containing "American Nazi" propaganda, among other things. Also removed were documents "with possible co-conspirators."

Gilbert police say Ready shot and killed four people on Wednesday, including his girlfriend, his girlfriend's daughter and her boyfriend, and his girlfriend's 16-month old granddaughter. They say he then turned the gun on himself.